We are at an unprecedented and never before point in history. The entire world and every major economy is now run by Central Banks, printing completely unbacked money, at near zero (or lower!) interest rates and running money printing schemes like QE to support asset prices and stock markets.
So the USA has huge debts, with $ Trillions in unfunded social liabilities? China, Europe and Japan are likely in even worse shape. So if one goes down, they all go down. And if they all are in the same situation, where is money going to run to?
I don’t have the answers - only that considerations of debt-collapse are quite different if everyone on the planet is in exactly the same boat.
Folks in the cities will quickly eat all the dogs, cats and pot-bellied pigs near them; then they are gonna try to come out to the boonies to see where I store MY food!